New commands: rm rmdir rm-rf mkdir mkdir-p chmod chown

daemon/Makefile.am

@@ -23,6 +23,7 @@ guestfsd_SOURCES = \
 	augeas.c \
 	daemon.h \
 	devsparts.c \
+	dir.c \
 	file.c \
 	guestfsd.c \
 	ls.c \

daemon/dir.c

@@ -0,0 +1,167 @@
+/* libguestfs - the guestfsd daemon
+ * Copyright (C) 2009 Red Hat Inc. 
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "../src/guestfs_protocol.h"
+#include "daemon.h"
+#include "actions.h"
+
+int
+do_rmdir (const char *path)
+{
+  int r;
+
+  NEED_ROOT (-1);
+  ABS_PATH (path, -1);
+
+  CHROOT_IN;
+  r = rmdir (path);
+  CHROOT_OUT;
+
+  if (r == -1) {
+    reply_with_perror ("rmdir: %s", path);
+    return -1;
+  }
+
+  return 0;
+}
+
+/* This implementation is quick and dirty, and allows people to try
+ * to remove parts of the initramfs (eg. "rm -r /..") but if people
+ * do stupid stuff, who are we to try to stop them?
+ */
+int
+do_rm_rf (const char *path)
+{
+  int r, len;
+  char *buf, *err;
+
+  NEED_ROOT (-1);
+  ABS_PATH (path, -1);
+
+  if (strcmp (path, "/") == 0) {
+    reply_with_error ("rm -rf: cannot remove root directory");
+    return -1;
+  }
+
+  len = strlen (path) + 9;
+  buf = malloc (len);
+  if (buf == NULL) {
+    reply_with_perror ("malloc");
+    return -1;
+  }
+
+  snprintf (buf, len, "/sysroot%s", path);
+
+  r = command (NULL, &err, "rm", "-rf", buf);
+  free (buf);
+
+  /* rm -rf is never supposed to fail.  I/O errors perhaps? */
+  if (r == -1) {
+    reply_with_error ("rm -rf: %s: %s", path, err);
+    free (err);
+    return -1;
+  }
+
+  free (err);
+
+  return 0;
+}
+
+int
+do_mkdir (const char *path)
+{
+  int r;
+
+  NEED_ROOT (-1);
+  ABS_PATH (path, -1);
+
+  CHROOT_IN;
+  r = mkdir (path, 0777);
+  CHROOT_OUT;
+
+  if (r == -1) {
+    reply_with_perror ("mkdir: %s", path);
+    return -1;
+  }
+
+  return 0;
+}
+
+static int
+recursive_mkdir (const char *path)
+{
+  int loop = 0;
+  int r;
+  char *ppath, *p;
+
+ again:
+  r = mkdir (path, 0777);
+  if (r == -1) {
+    if (!loop && errno == ENOENT) {
+      loop = 1;			/* Stops it looping forever. */
+
+      /* If we're at the root, and we failed, just give up. */
+      if (path[0] == '/' && path[1] == '\0') return -1;
+
+      /* Try to make the parent directory first. */
+      ppath = strdup (path);
+      if (ppath == NULL) return -1;
+
+      p = strrchr (ppath, '/');
+      if (p) *p = '\0';
+
+      r = recursive_mkdir (ppath);
+      free (ppath);
+
+      if (r == -1) return -1;
+
+      goto again;
+    } else	  /* Failed for some other reason, so return error. */
+      return -1;
+  }
+  return 0;
+}
+
+int
+do_mkdir_p (const char *path)
+{
+  int r;
+
+  NEED_ROOT (-1);
+  ABS_PATH (path, -1);
+
+  CHROOT_IN;
+  r = recursive_mkdir (path);
+  CHROOT_OUT;
+
+  if (r == -1) {
+    reply_with_perror ("mkdir -p: %s", path);
+    return -1;
+  }
+
+  return 0;
+}

daemon/file.c

@@ -180,3 +180,63 @@ do_read_lines (const char *path)
 
   return r;
 }
+
+int
+do_rm (const char *path)
+{
+  int r;
+
+  NEED_ROOT (-1);
+  ABS_PATH (path, -1);
+
+  CHROOT_IN;
+  r = unlink (path);
+  CHROOT_OUT;
+
+  if (r == -1) {
+    reply_with_perror ("unlink: %s", path);
+    return -1;
+  }
+
+  return 0;
+}
+
+int
+do_chmod (int mode, const char *path)
+{
+  int r;
+
+  NEED_ROOT (-1);
+  ABS_PATH (path, -1);
+
+  CHROOT_IN;
+  r = chmod (path, mode);
+  CHROOT_OUT;
+
+  if (r == -1) {
+    reply_with_perror ("chmod: %s: 0%o", path, mode);
+    return -1;
+  }
+
+  return 0;
+}
+
+int
+do_chown (int owner, int group, const char *path)
+{
+  int r;
+
+  NEED_ROOT (-1);
+  ABS_PATH (path, -1);
+
+  CHROOT_IN;
+  r = chown (path, owner, group);
+  CHROOT_OUT;
+
+  if (r == -1) {
+    reply_with_perror ("chown: %s: %d.%d", path, owner, group);
+    return -1;
+  }
+
+  return 0;
+}

src/generator.ml

@@ -64,6 +64,14 @@ and ret =
   | RVGList of string
   | RLVList of string
 and args = argt list	(* Function parameters, guestfs handle is implicit. *)
+
+    (* Note in future we should allow a "variable args" parameter as
+     * the final parameter, to allow commands like
+     *   chmod mode file [file(s)...]
+     * This is not implemented yet, but many commands (such as chmod)
+     * are currently defined with the argument order keeping this future
+     * possibility in mind.
+     *)
 and argt =
   | String of string	(* const char *name, cannot be NULL *)
   | OptString of string	(* const char *name, may be NULL *)
@@ -483,6 +491,48 @@ details.");
 This is just a shortcut for listing C<guestfs_aug_match>
 C<path/*> and sorting the resulting nodes into alphabetical order.");
 
+  ("rm", (RErr, [String "path"]), 29, [],
+   "remove a file",
+   "\
+Remove the single file C<path>.");
+
+  ("rmdir", (RErr, [String "path"]), 30, [],
+   "remove a directory",
+   "\
+Remove the single directory C<path>.");
+
+  ("rm_rf", (RErr, [String "path"]), 31, [],
+   "remove a file or directory recursively",
+   "\
+Remove the file or directory C<path>, recursively removing the
+contents if its a directory.  This is like the C<rm -rf> shell
+command.");
+
+  ("mkdir", (RErr, [String "path"]), 32, [],
+   "create a directory",
+   "\
+Create a directory named C<path>.");
+
+  ("mkdir_p", (RErr, [String "path"]), 33, [],
+   "create a directory and parents",
+   "\
+Create a directory named C<path>, creating any parent directories
+as necessary.  This is like the C<mkdir -p> shell command.");
+
+  ("chmod", (RErr, [Int "mode"; String "path"]), 34, [],
+   "change file mode",
+   "\
+Change the mode (permissions) of C<path> to C<mode>.  Only
+numeric modes are supported.");
+
+  ("chown", (RErr, [Int "owner"; Int "group"; String "path"]), 35, [],
+   "change file owner and group",
+   "\
+Change the file owner to C<owner> and group to C<group>.
+
+Only numeric uid and gid are supported.  If you want to use
+names, you will need to locate and parse the password file
+yourself (Augeas support makes this relatively easy).");
 ]
 
 let all_functions = non_daemon_functions @ daemon_functions